阅读下面代码段:public class Test{public static void main(String args[]){char ch;switch(ch)
阅读下面代码段:public class Test{ public static void main(String args[]){ char ch; switch(ch) { case'a':System.out.print("abc");break; case'b':System.out.print("ab"); case'c':System.out.print("c");break; default:System.out.print("abc"); } }}不输出"abc"的ch值是 ()
A.'a'
B.'b'
C.'c'
D.'d'